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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_FILES_FILE_TRACING_H_
#define BASE_FILES_FILE_TRACING_H_
#include "base/basictypes.h"
#include "base/macros.h"
#include "base/trace_event/trace_event.h"
#define FILE_TRACING_PREFIX "File"
#define FILE_TRACING_BEGIN() \
TRACE_EVENT_NESTABLE_ASYNC_BEGIN0( \
base::kFileTracingEventCategoryGroup, FILE_TRACING_PREFIX, this)
#define FILE_TRACING_END() \
TRACE_EVENT_NESTABLE_ASYNC_END0( \
base::kFileTracingEventCategoryGroup, FILE_TRACING_PREFIX, this)
#define SCOPED_FILE_TRACE_WITH_SIZE(name, size) \
base::ScopedFileTrace scoped_file_trace; \
do { \
bool category_enabled; \
TRACE_EVENT_CATEGORY_GROUP_ENABLED( \
base::kFileTracingEventCategoryGroup, &category_enabled); \
if (category_enabled) \
scoped_file_trace.Initialize( \
FILE_TRACING_PREFIX "::" name, this, size); \
} while (0)
#define SCOPED_FILE_TRACE(name) SCOPED_FILE_TRACE_WITH_SIZE(name, 0)
namespace base {
class File;
extern const char kFileTracingEventCategoryGroup[];
class ScopedFileTrace {
public:
ScopedFileTrace();
~ScopedFileTrace();
// Called only if the tracing category is enabled.
void Initialize(const char* event, File* file, int64 size);
private:
// True if |Initialize()| has been called. Don't touch |path_|, |event_|,
// or |bytes_| if |initialized_| is false.
bool initialized_;
// The event name to trace (e.g. "Read", "Write"). Prefixed with "base::File".
const char* name_;
// The file being traced. Must outlive this class.
File* file_;
// The size (in bytes) of this trace. Not reported if 0.
int64 size_;
DISALLOW_COPY_AND_ASSIGN(ScopedFileTrace);
};
} // namespace base
#endif // BASE_FILES_FILE_TRACING_H_
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